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• kfx - https://fileinfo.com/extension/kfx - Kindle File Format

Snippet from Wikipedia: Filename extension

A filename extension, file name extension or file extension is a suffix to the name of a computer file (for example, .txt, .docx, .md). The extension indicates a characteristic of the file contents or its intended use. A filename extension is typically delimited from the rest of the filename with a period, but in some systems it is separated with spaces.

Some file systems implement filename extensions as a feature of the file system itself and may limit the length and format of the extension, while others treat filename extensions as part of the filename without special distinction.

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